Clear plastic tee with Harwil directional flow switch. Clear plastic for easy viewing of any debris in switch. Hi impact surgical plastic housing. 3/4 inch hose connections. 3/8 inch freeze line connection. Directional arrow stickers affixed for ease of install. Details: Brand: Harwil P/N 6560-860 replaces 6560-858 3/4 inch barb ends 3/8 inch freeze line connection Wire with box end connectors Used on the following hot tubs: Sundance Spas 06/1999-2015 850/880 Series: Maxxus, Optima, Cameo, Majesta, Altamar, Marin Sundance Spas 880 series Aspen 2012-2015 Sundance Spas 850/880 series Capri 1 pump 2001-2015 Jacuzzi J-300 LCD Series Models, 2002+ (with box end connectors) If you have 2002+ LED J-300 use the 2560-040 (Curled Finger Connectors) Product note: Flow Switch now comes molded with a 3/32" hole opening. Prior to Feb. 2008 a 3/32" hole had to be drilled for it to be installed on all 2002 to mid 2008 2- and 3-pump Sundance models (except Capri). Plug used but not drilled on 2001+ Capri.